WTB a Pro tip

Hey guys, old lurker new poster here.
Recently I've been looking at new legendaries, rings specifically, and noticed Skulls Grasp. For those of you unfamiliar with the item it's a ring which, along the usual stats found on rings, can spawn a skill bonus. What interests me however is whether this bonus will stack with other items providing the same bonus, and if it does indeed stack is there a cap to it?
For example: I've got a quiver with +14% to Elemental Arrow damage. Let's say I buy one those rings, which would give me and additional bonus of +10% to Elemental Arrows damage. Would that leave me with 24% boost to EA? Is there a cap?

Edit: I realise that I can't get more then 1 legendary. Let's assume I have a 14% to EA quiver, and buy a 10% to EA ring instead. Will those stack and is there a cap?